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Advanced 24GHz mmWave Human Presence Sensor with Micro-Motion Detection for Smart Home Automation and IoT Systems
The Fermion C4002 mmWave Human Presence Sensor is an advanced radar-based detection module designed to deliver accurate and reliable occupancy sensing beyond the limitations of traditional PIR sensors. Using 24GHz FMCW (Frequency Modulated Continuous Wave) technology, this sensor can detect not only motion but also micro-movements such as breathing and slight body shifts. This enables true presence detection, ensuring that lights, HVAC systems, and automation routines remain active even when occupants are stationary. With a detection range of up to 10x10 metres, it is ideal for smart home environments, offices, and security systems.
Engineered for seamless integration with Home Assistant and IoT platforms, the C4002 sensor provides precise differentiation between moving, stationary, and micro-moving targets. Its high sensitivity and stable performance make it suitable for intelligent automation scenarios where reliability is critical. Compact and efficient, this module is perfect for smart lighting control, energy-efficient building systems, and advanced occupancy-based automation.
Key Features
- 24GHz mmWave Radar Technology: FMCW-based detection for high accuracy and reliability
- True Presence Detection: Detects motion, stationary presence, and micro-movements like breathing
- Wide Detection Range: Covers up to 10mx10m area
- Micro-Motion Sensing: Overcomes PIR limitations by detecting subtle human activity
- Smart Automation Ready: Ideal for Home Assistant and IoT-based systems
- High Sensitivity: Accurate occupancy detection for lighting and HVAC control
- Reliable Performance: Stable operation in varying environmental conditions
- Compact Design: Easy integration into embedded and smart home projects
Streamlined Home Assistant Integration
Designed to simplify the development process, eliminating the need for complex reverse-engineering.
- Hardware Ready: ESP32 controllers can be simply connected using a standard UART interface.
- Software Ready: Compatible with ESPHome (Home Assistant).A verified YAML configuration file is included for fast deployment.
- Instant Entities: When you flash Home Assistant, the "Occupancy," "Distance," and "Energy" entities are automatically exposed.
Figure: True Static & Motion Human Presence of Fermion C4002 mmWave radar module
True Static Presence Detection (10x10m Range)
Capable of detecting individuals who are sitting, sleeping, or standing completely still. Ideal for bedrooms, offices, and bathrooms.
- Motion Detection: Up to 11m (Walking / Running).
- Static Detection: Up to 10m (Reading / Typing / Sleeping).
Figure: Detection Range of Fermion C4002 mmWave radar module
Precision Control for Complex Environments
Unlike passive sensors with fixed ranges, the C4002 offers a software-configurable detection distance. This capability allows for precise matching of the sensor's coverage to the physical room layout.
- Targeted Monitoring: Set the sensor to monitor only specified functional areas (such as a sofa or desk) while completely ignoring activity in nearby backgrounds (such as hallways or open doors).
- Wall Penetration Management: By specifying a maximum distance threshold, users can prevent the radar signal from penetrating thin walls and detecting activity in adjacent rooms.
- Adaptability: Suitable for a wide range of areas, from small restrooms to huge open-plan living rooms.
Intelligent Environmental Filtering
To prevent false triggers common in radar technology (e.g., swaying plants, moving curtains), the C4002 incorporates adaptive background noise learning. The module automatically establishes a noise model of the environment, filtering out non-human interference to ensure triggers occur only upon actual human presence.
Figure: Anti-Interference of Fermion C4002 mmWave radar module
Applications:
Smart illumination Automation: Maintains illumination based on genuine presence (breathing/micro-motion) rather than major motions, which eliminates the problem of lights shutting off while reading or working.
- HVAC Energy Management: Automatically starts air conditioning or heating only when the space is occupied, hence increasing energy efficiency in homes or offices.
- Privacy-Friendly Elderly Care: Detects presence or prolonged inactivity in bedrooms or bathrooms without the use of intrusive cameras or wearable technology.
- Concealed Security: Capable of detecting infiltration via thin non-metal barriers (such as decorations or thin walls), allowing for a completely concealed security system.
Package Content:
- Fermion: C4002 mmWave Human Presence Sensorx1
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